(MFC) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkCert.h>
#include <CkCertChain.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http;

    // We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
    CkCert *sslCert = http.GetServerSslCert("nationalgeographic.com",443);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
    // be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
    // will be returned.  The certificate chain's ReachesRoot property can be examined to 
    // see if the chain was completed to the root.
    CkCertChain *certChain = sslCert->GetCertChain();
    if (sslCert->get_LastMethodSuccess() == false) {
        strOut.append(sslCert->lastErrorText());
        strOut.append("\r\n");
        delete sslCert;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int i = 0;
    int numCerts = certChain->get_NumCerts();
    while (i < numCerts) {
        CkCert *cert = certChain->GetCert(i);
        strOut.append("SubjectDN ");
        strOut.appendInt(i);
        strOut.append(": ");
        strOut.append(cert->subjectDN());
        strOut.append("\r\n");
        strOut.append("IssuerDN ");
        strOut.appendInt(i);
        strOut.append(": ");
        strOut.append(cert->issuerDN());
        strOut.append("\r\n");
        delete cert;
        i = i + 1;
    }

    // If the certificate chain reaches the root CA cert, then the last cert in the chain
    // is the root CA cert.
    if (certChain->get_ReachesRoot() == true) {
        CkCert *caCert = certChain->GetCert(numCerts - 1);
        strOut.append("CA Root Cert: ");
        strOut.append(caCert->subjectDN());
        strOut.append("\r\n");
        delete caCert;
    }

    delete sslCert;
    delete certChain;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }